40475821 has 2 divisors, whose sum is σ = 40475822. Its totient is φ = 40475820.

The previous prime is 40475803. The next prime is 40475843. The reversal of 40475821 is 12857404.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33767721 + 6708100 = 5811^2 + 2590^2 .

It is a cyclic number.

It is not a de Polignac number, because 40475821 - 2⁷ = 40475693 is a prime.

It is equal to p_2460874 and since 40475821 and 2460874 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40475881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20237910 + 20237911.

It is an arithmetic number, because the mean of its divisors is an integer number (20237911).

Almost surely, 2^40475821 is an apocalyptic number.

It is an amenable number.

40475821 is a deficient number, since it is larger than the sum of its proper divisors (1).

40475821 is an equidigital number, since it uses as much as digits as its factorization.

40475821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8960, while the sum is 31.

The square root of 40475821 is about 6362.0610654095. The cubic root of 40475821 is about 343.3459183079.

The spelling of 40475821 in words is "forty million, four hundred seventy-five thousand, eight hundred twenty-one".